@tool-size: 50px;
@tool-hover-bg: #F9F9F9;
@tool-shadow: #CCCCCC;
.side-tool {
  position: fixed;
  bottom: 55px;
  right: 60px;
  ul li {
    width: @tool-size;
    height: @tool-size;
    text-align: center;
    line-height: @tool-size;
    box-shadow: 0 0 1px @tool-shadow;
    &:hover {
      background: @tool-hover-bg;
      cursor: pointer;
    }
  }

}